Water treatment pump with measuring trap



NOV. 21, 1950 v v. B. COLDSNOW 2,530,682

WATER TREATMENT PUMP WITH MEASURING TRAP Filed March 5, 1949 2 Sheets-Sheet l 3.3 52 WW 30 k" H {k I I 5/ "U'1;.J"L.F'

Fig. 1

A as 74 54 IN VEN TOR.

2 Sheets-Sheet 2 HVVENTDR.

MPM

Nov. 21, 1950 v. B. COLDSNOW WATER TREATMENT PUMP WITH MEASURING TRAP Filed March 5, 1949 Patented Nov. 21, 1950 WATER TREATMENT PUMP WITH MEASURING TRAP Van B. Coldsnow, St. Clair Shores, Mich., assignor to Dihydrol Company, Detroit, Mich.

Application March 5, 1949', Serial No. 79,887

1 Claim.

This application relates to water treatment systems and discloses a system which includes a unidirectional switch and a unidirectional pumpand a solenoid controlled by said switch for actuating said pump, and which is characterized by the provision of a novel metering pump which is constructed to pump a metered amount and only in a predetermined direction, i. e., from the supply of water treatment fluid to the branch line through which flows the water being treated,.with= the. pump arranged for preventing fiow from the. pump: except in the predetermined direction and thenonly when the water being treated. likewise flows in a predetermined direction.

A system. constructed in accordance with the foregoing is disclosedv in. the. appended. drawings.

In these drawings Fig. 1 shows-the. system. generally.

Fig.2 is-a section view ofthe metering pump and. actuation means. therefor, as if on line 2-2 of. Fig.1-

Fig. 3 is a section view of the metering pump per se, asif on line 33 of Fig. 2.

Fig. 4 shows the switch. per sen Fig. 5 is a detailed view of a part of the switch.

Referring to the. drawings, it will be seen that Fig. 1 shows a water main. or line It} having a normally closed shut off valve H and having. a branch l2 containing normally open shut off valves l4 and [5. It is the branch I2 that is equipped with the switch 25, the actuation arrangement 2| and the metering pump 22, now to be described.

In the inlet side of' the branch i2. is a conventional' water meter 39 whose rotary member BI is provided with a shaft 32 entering a switch housing, 33 whereby normally to rotate clockwise a turntable 34, Fig. 4', having numerous spaced pins 35 for successively engaging a rocker arm 36 pivoted at 3! to a mounting plate 38 and constantly biased clockwise, Fig. 4, by a biasing spring 35!. The rocker arm 36 is articulated or broken, having pivotally mounted thereon, as by a pivot pin 40,v a member 4| which is the part engaged by turntable pins 35. Member 5i is connected by a coil spring 42 to a leaf spring arm 43 normally disposed under the zig-Zag shaped edge 44 of a rocking plate 4:5 pivoted at 46 on a post 47' in turn mounted on the stationary plate 38 of the switch.

The pivot axis 4% is' in the form of an axle journalled in the post 4! to which axle is fixed the plate 15. Also fixed to this axle is a counterweight'55 and a tiltable mercury switch 51 which 2. when tilted closes the circuit between the supply conductors 52 and the conductors 53 leading to the pump-actuation means 2|, the latter being in the form of a solenoid 54. At 55 is shown a stop for the counterweight 50..

Normally the rotary member 3| of the meter rotates in a manner to rotate the turntable 34 clockwise, Fig. 4, so that pins 35 successively rock'the rock-er arm 35-4I counterclockwise and successively close the circuit through conductors 52 and 53 and thus successively and repeatedly energize the solenoid 54 for reasons later to be described. However, due to the articulation of the rocker arm lit-4|, which is ineffect a broken arm, reverse rotation of the rotary member 3'1 of the meter 30 due to reverse flow of water in the branch l2, though causing reverse rotation of the turntable 34, will not cause reverse or clockwise rotation of the rocker arm 364I and will not cause repeated tilting of the mercury switch 51 and will not cause repeated circuit closing and energization of the solenoid 54.

Assuming the flow in branch 12 to be in the proper direction, as indicated by the arrows, repeated energization of the solenoid 54 of theactuating means 2l' will cause repeated operation of the pump 22 for repeated injections of measured minute quantities of water treatment fluid from the tank 56 into the branch line H through the line 51 which connects the pump outlet to the branch line [2.

As a measured minute quantity of water treatment fluid is pumped out through the pump outlet 60 it enters the line 51 and is carried into the branch line l2;

The pump itself, shown in Fig. 3, is disposed in a, tank 55 fastened to the lower portion of the branch line [2, as by stirrups 68, and to the vertical leg of the branch line I2, as by a bracket or stirrup 65., The cover 12 of, the tank 56 is fastened to the tank itself by screws 13. Cover 12 has a filling spout l4 which is locked by means, not shown.

The pump has a base formed with numerous passageways and orifices, and these have valves and operating parts which will operate in the following manner.

Two vertical pumping shafts 8%l8l of the pump are shown inFig. 3 in their lowermost po sition, and valve closing balls 82,-il3848586 which close the various valves under them are also shown in lowermost or closing position. Shaft 8! pumps fluid from tank 56 into the pump itself and shaft 89 pumps a metered amount of fluid from the pump to outlet 6!].

As the solenoid 54 is energized it rocks a rocker arm Bl clockwise, Fig. 2, on fulcrum 81a to lift a connector or yoke 88 and thus lift the two pump shafts 808l with the following results: Pump shaft ill causes water treatment fluid within the tank 58 to flow upwardly through screened inlet tube 89, past the open valve ball 33, and enter the passage 9! to flow past the open valve ball 85 and enter a spout 92 fastened to a cover 93 of a sight glass 94 on cover 12. Fluid entering the spout 92 from below leaves the spout at its open end 95 to form a pool of a level no higher than as indicated at 96, the level being maintained by an overflow tube 9'! connecting the interior of the sight glass 94 and the interior of the tank 56, as shown. The pool 96, however, will empty, not completely, but to an extent determined by the stroke of pump shaft '89. and fluid from pool 95 will be pumped by shaft 86 and descend through passageway I!!! and flow through passageway !E12! 93 past the open valve ball 82 to the passageway H14 then past the open valve ball 84 to passageway I55 past the open valve ball 86 to outlet 69.

Thus, upon each actuation of the solenoid 55 there is in ected into the line 51 a minute measured quantity of the water treatment fluid within the tank 56 obtained from the pool 96. At the same time pool 96 is replenished.

It is noted that rocker arm 3'! is connected to yoke 88 through a separable and adjustable connection rod 132 which is secured to the yoke 88 by the adjusting nuts 133 and which is detachably connected by a screw pin I34 to the rocker arm. Similarly, rocker arm '87 i d tachabl and adjustably connected to the solenoid plunger I35- by a. pin l which may be disposed in any one of several adjusting holes l 3! of the plunger 1 These two adjustments are available to vary the stroke of the pumping rods 8-9 and 8! and thus to vary the amount of fluid being pumped from the tank into the pool 95 and the amount being pumped from that pool 95 to the pump outlet 60.

It is al o noted that the return of the rocker arm to the position shown in Fig. 2 is accomplished by means of a spring 14!! which const ntly biases the rocker arm counter lo kwise and thus op o es the action of the solenoid 54.

It is noted that the pum ing of fluid into the pool 96 is adjusted to be great r in amount than the pumpin of fluid from t at ool to outlet 61!. Hence the flow into the pool 96 is always greater than the flow out of that pool and thus there is always maintained a pool 96 which overflows through pi e 91. In this way there is insured suflicient flow out of the pump outlet 5!! but not an excess amount, since the amount is determined by the metering action of pump shaft 80 and by the overflow 91. The withdrawal from the pool 96 to outlet 69 is determined bv plunger 8!! and, hence, the pool 95 is not emptied completely on each stroke. and in this way it is assured that no air is pumped from the reser oir 94 to the outl t 6'! but only a metered ouantity of fluid forming part of the pool 96. In this way it is insured that the pump cannot become air bound.

It is also noted that the cover 93 of the reservoir 94 is provided with vent holes Hit, and that the gap between spout 95 and pool 96 is an air gap which guarantees that there will be no flow out Of the pump in the event of a reduction of pressure on the inlet side of the pump, or at outet ea, or the establishing of a vacuum on the inlet side of the pump or at outlet 69. In the event of a break in the inlet line 12 and thus a reduction of pressure or a vacuum at the pump outlet 69, there will, nevertheless, be no flow from the tank 56 to the outlet 60 because of the air gap between the spout and. the pool 95. In the event of a break in the inlet line only, the amount of liquid in the pool 96 can flow to the outlet 60. There cannot be any flow out of the tank 56 to the pool 96. This operation presupposes the opening of the vents at 15! and it is important that these vents be kept open for, obviously, if these vents are plugged, then no such guarantee can be assured.

In this way there is provided a system which injects minute measured quantities of water treatment fluid into the branch line I2 in response to the rate of flow in the branch line l2 in the proper direction as indicated. The systern will not operate in response to reverse flow in the branch line nor will the pump permit a continuing flow to take place from the pump to the pump outlet.

Now having described the system here shown, reference should be had to the claim which follows:

In a pump for pumping fluid from a supply to a water line, a vented reservoir above said supply, means communicating said supply and said reservoir, said communication means terminating in a retroverted downspout at the top of the reservoir and opening downwardly to empty to the lower part of said reservoir, the latter having a discharge opening in its bottom wall, means communicating said discharge opening with said water line, an overflow tube in the lower part of said reservoir having its lower end opening into said supply and its upper open end opening into said reservoir at a point somewhat above the bottom wall of the resrvoir, whereby a pool of fluid is maintained in the lower part of said reservoir to a level not above the upper open end of said overflow tube, with such upper open end also being well below the downspout which inlets into said reservoir from said supply to form an air gap between said downspout and said pool and the water line, and means for pumping fluid from said supply through the communication between it and the resrvoir and through the downspout to form said pool in said reservoir and for pumping a metered quantity from said pool to said water line through the communication between them.

VAN B. COLDSNOW.

REFERENCES CITED The following references are of record in the flie of this patent:

UNITED STATES PATENTS Number Name Date 1,051,888 Hockgesand Feb. 4, 1913 1,261,061 Seymour Apr. 2, 1918 2,238,747 Ornstein Apr. 15, 1941 2,264,459 Sims Dec. 2, 1941 2,310,459 Potter Feb. 9, 1943 2,417,372 Morris Mar. 11, 1947 

